“Our view of Buster is that he’ll be reasonable,” Giants CEO Larry Baer said. “We’ve thrown some things out. They’ve thrown some things out. It’s going to be more evolved over time. It’s not a 'check back in two weeks, we may have something' kind of thing.”

Posey, 25, is coming off an NL MVP season in which he hit .336/.408/.549 with 24 homers and 103 RBIs. He also added the NL Comeback Player of the Year Award and an NL batting title to his accomplishments in his first season back from serious ankle/leg injuries suffered in a home-plate collision in May of 2011.

Baer said an extension with Posey is a "matter of importance," but not as urgent as negotiations with All-Star pitcher Matt Cain last spring. In April, Cain and the Giants agreed to a $127.5 million, six-year contract that kept the righthander from becoming a free agent this past offseason.

“Buster knows he’s going to be a Giant for the next four years, at least,” Baer said. “There isn’t that kick of, 'Come October, I might be changing uniforms.' He’s not changing uniforms.”

In just three major league seasons, Posey has emerged as one of baseball's brightest stars. In addition to the MVP and Comeback awards, he was the 2010 NL Rookie of the Year and has helped lead San Francisco to its first two World Series titles.

He is a lifetime .314/.380/.503 hitter with 46 home runs and 191 RBIs.